The integral relief valve can only protect the motor and the gear, and then
only against impermissible positive pressure that is caused by the
metering pump itself. It cannot protect the system against positive pres‐
sure.
The integral relief valve works as a bleed valve as soon as the rotary dial
(3) is turned to "open": The valve opens and the liquid end can be bled. Or
it is used as a priming aid for priming against pressure.
Fig. 10: Relief valve and integrated relief valve
1 Spring, large
2 Ball
3 Rotary dial
5 Hose connection
5.4 Multi-layer safety diaphragm
With the visual diaphragm rupture sensor, the lowered red cylinder (6)
springs forward beneath the transparent cover (7) so that it then becomes
clearly visible
Fig. 11.
With the electrical diaphragm rupture sensor, a switch is switched. A con‐
nected signalling device must signal the diaphragm rupture.
Fig. 11: Visual diaphragm rupture sensor, triggered and untriggered
The electrical diaphragm rupture sensor is connected to the "diaphragm
rupture indicator" terminal. If a diaphragm ruptures, the red LED "Fault"
display lights up on the pump and the identifier "Error" and
‘dia’
flash on
the LCD screen.
5.5 Operating modes
The operating modes are selected via the
‘Operating mode’
menu (some
operating modes may not be present depending on the identity code.)
Functional description
20
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